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Thermal degradations of chlorinated natural rubber from latex and chlorinated natural rubber from solution
Author(s) -
Cai Ying,
Li SiDong,
Li ChengPeng,
Li PuWang,
Wang Chen,
Lv MingZhe,
Xu Kui
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26531
Subject(s) - thermogravimetric analysis , thermal stability , natural rubber , degradation (telecommunications) , materials science , fourier transform infrared spectroscopy , polymer chemistry , activation energy , chemistry , nuclear chemistry , chemical engineering , organic chemistry , composite material , telecommunications , computer science , engineering
The thermal degradations of chlorinated natural rubbers from latex (CNR‐L) and from solution (CNR‐S) under nitrogen atmosphere were studied with thermogravimetric analysis (TGA). The thermal degradations of CNR‐L and CNR‐S are one‐step reaction. The shapes of the thermogravimetric and derivative thermogravimetric curves are similar. The degradation temperatures of CNR‐L and CNR‐S increase linearly with the increment of heating rates. The heating rate hardly affects the thermal degradation rates of CNR‐L and CNR‐S at the various degradation stages. The thermal degradations of CNR‐S and CNR‐L are dehydrochlonation reactions. The reaction activation energy ( E ) of CNR, at the first stage, is around 100 kJ/mol. After that, E remains relatively steady (80–140 kJ/mol). At the last stage, E rises rapidly (130–270 kJ/mol). The variation tendency of frequency factor ( A ) is similar to that of E . As the initial degradation temperature T 0 of CNR‐L is 10.9°C lower than that of CNR‐S, the thermal stability of CNR‐S is better than that of CNR‐L, which may be caused by the difference of molecular structure between CNR‐L and CNR‐S, as FTIR results indicate that there are more OH, CO and COO groups in the CNR‐L molecular chains. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007